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fix: flip projection Y for Vulkan (M22 *= -1) — fixes fish-eye distortion

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System.Numerics.CreatePerspectiveFieldOfView uses DirectX convention (Y up).
Vulkan clip space has Y down. Negating M22 corrects the projection.
Depth is already [0,1] in System.Numerics (DirectX-style), no remap needed.
This commit is contained in:
emil28092005
2026-06-18 16:53:48 +03:00
parent fcbc42959e
commit 44bae31495
1 changed files with 6 additions and 3 deletions
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src/Engine.Graphics.Vulkan/VulkanRenderer.cs
+6 -3
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@@ -57,15 +57,18 @@ internal sealed unsafe class VulkanRenderer : IRenderer, Engine.Graphics.IScreen
{
var aspect = (float)_swapchain.Extent.Width / (float)_swapchain.Extent.Height;
cam.AspectRatio = aspect;
vp = cam.GetViewMatrix() * cam.GetProjectionMatrix();
var proj = cam.GetProjectionMatrix();
proj.M22 *= -1;
vp = cam.GetViewMatrix() * proj;
found = true;
});
if (!found)
{
var aspect = (float)_swapchain.Extent.Width / (float)_swapchain.Extent.Height;
vp = Matrix4x4.CreateLookAt(new Vector3(0, 0, -6), Vector3.Zero, Vector3.UnitY)
* Matrix4x4.CreatePerspectiveFieldOfView(MathF.PI / 4f, aspect, 0.1f, 100f);
var proj = Matrix4x4.CreatePerspectiveFieldOfView(MathF.PI / 4f, aspect, 0.1f, 100f);
proj.M22 *= -1;
vp = Matrix4x4.CreateLookAt(new Vector3(0, 0, -6), Vector3.Zero, Vector3.UnitY) * proj;
}
Render(vp);